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I can see only images and audio files via USB in my samsung TV.

Hi, You cannot. According to the user guide for your TV it only supports .jpeg and .mp3 files via the USB port. This is from p.5 of the manual WISELINK Connect a USB mass storage device to view ‘‘photo files (JPEG) and play ‘‘audio files (MP3)’’’’ To watch movies from a USB drive, you would have to insert it into a device such as a PVR or STB that had a USB connection and which also supported the movie file type e.g .avi that you wish to play and then connect it to the TV via HDMI, component. composite or S-video depending on what connection types it had.